What's the best cal mag

growsince79 · Sep 24, 2021

Just trying to learn about calmag and what others are using and why.
.
I just finished a bottle of Foxfarm calmag. It says derived from calcium carbonate and mag sulfate. The store was out, so I got a bottle of GH calimagic. This stuff says derived from calcium glocoheptonate, calcium nitrate, magnesium nitrate.
I mixed up a batch last night and noticed the ppm of GH is about double that of the FF. Both call for 1 tsp/ gal. Should I go with the higher ppm or cut the amount in half?
@Aqua Man

DankNugz420 · Sep 24, 2021

Personally I would probly test using the same ppms instead of the hard measurement just to see if the plants act same or different.

Allegedly · Sep 24, 2021

growsince79 said:
Just trying to learn about calmag and what others are using and why.
.
I just finished a bottle of Foxfarm calmag. It says derived from calcium carbonate and mag sulfate. The store was out, so I got a bottle of GH calimagic. This stuff says derived from calcium glocoheptonate, calcium nitrate, magnesium nitrate.
I mixed up a batch last night and noticed the ppm of GH is about double that of the FF. Both call for 1 tsp/ gal. Should I go with the higher ppm or cut the amount in half?
@Aqua Man

i use 3-4 ml per gal of calimagic personally, with tap water (my tap water ppm is about 300).

TheBadChoice · Sep 24, 2021

growsince79 said:
Just trying to learn about calmag and what others are using and why.
.
I just finished a bottle of Foxfarm calmag. It says derived from calcium carbonate and mag sulfate. The store was out, so I got a bottle of GH calimagic. This stuff says derived from calcium glocoheptonate, calcium nitrate, magnesium nitrate.
I mixed up a batch last night and noticed the ppm of GH is about double that of the FF. Both call for 1 tsp/ gal. Should I go with the higher ppm or cut the amount in half?
@Aqua Man

GH and botincare cal mag is a higher base ppm so less ml should be needed I would think as well depending on the medium your growing in.
I doing coco like aqua which ya need more cal mag, have come across bloom city cal mag and I like it a lot it have a couple more micro nutes in it compared to other brands that I’ve ran(Botincare cal mag+).
Also bloom city makes a real nice silica additive too if you in search of that lol

DankNugz420 · Sep 24, 2021

The gh charts I use only call for 2.5 ml cal mag

growsince79 · Sep 24, 2021

DankNugz420 said:
The gh charts I use only call for 2.5 ml cal mag View attachment 1172143

Thanks for the help. I was going by the direction on bottle.

DankNugz420 · Sep 24, 2021

Np bud, you using coco? Theres probly a different chart im not 100% sure, I use promix hp and have good results with this chart other than I think it's a bit higher ppms than the plants really need specially in flower. Also im only running 1/4 strength in my hydro compared to their recirculating chart

growsince79 · Sep 24, 2021

DankNugz420 said:
Np bud, you using coco? Theres probly a different chart im not 100% sure, I use promix hp and have good results with this chart other than I think it's a bit higher ppms than the plants really need specially in flower. Also im only running 1/4 strength in my hydro compared to their recirculating chart

I'm using cocoloco with a little promix added. 2.5ml seems more reasonable and puts the ppms to about the same as 5ml foxfarm calmag.

TheBadChoice · Sep 24, 2021

growsince79 said:
I'm using cocoloco with a little promix added. 2.5ml seems more reasonable and puts the ppms to about the same as 5ml foxfarm calmag.

What type of water source you using?

growsince79 · Sep 24, 2021

TheBadChoice said:
What type of water source you using?

RO with a little tap mix.

MIMedGrower · Sep 24, 2021

Do you need cal mag @growsince79 ?Why not just mix tap and ro to about 150-200 ppm? That’s why we mix tap water in, no?

TheBadChoice · Sep 24, 2021

MIMedGrower said:
Do you need cal mag @growsince79 ?Why not just mix tap and ro to about 150-200 ppm? That’s why we mix tap water in, no?

See that’s one reason why I like bloom city cal mag, odd ball micros like manganese things you won’t find much of in tap water.

GreenMtnGuru · Sep 24, 2021

The Bloom City cal-mag is a personal favorite of mine.

I bought it on a whim a couple years ago. My plants really responded well to it, and I love the trace element ratios.

growsince79 · Sep 24, 2021

MIMedGrower said:
Do you need cal mag @growsince79 ?Why not just mix tap and ro to about 150-200 ppm? That’s why we mix tap water in, no?

That worked when I ran hps. With led I've been adding from week 1-4 flower. My straight tap is 400 @ 8.5. Rain is cheap but scarce.

growsince79 · Sep 24, 2021

MIMedGrower said:
Do you need cal mag @growsince79 ?Why not just mix tap and ro to about 150-200 ppm? That’s why we mix tap water in, no?

Tap water is mostly to buffer ph when I'm not adding silica. If I mix my nutes in straight ro the ph is like 5. With a little tap, it's about 6.2

MIMedGrower · Sep 24, 2021

growsince79 said:
That worked when I ran hps. With led I've been adding from week 1-4 flower. My straight tap is 400 @ 8.5. Rain is cheap but scarce.

I have heard this before about led but only some growers seem to feel they need it. I still haven’t used one here but when I grew with my caregiver in the beginning he had timber cobs and had only raised his base nutes a bit to compensate for the intensity (or spectrum?) compared to his hps.

MIMedGrower · Sep 24, 2021

TheBadChoice said:
See that’s one reason why I like bloom city cal mag, odd ball micros like manganese things you won’t find much of in tap water.

I guess if there is none in your soil or base nutrients. I never saw a manganese deficiency I dont think.

Moshmen · Sep 25, 2021

MIMedGrower said:
I have heard this before about led but only some growers seem to feel they need it. I still haven’t used one here but when I grew with my caregiver in the beginning he had timber cobs and had only raised his base nutes a bit to compensate for the intensity (or spectrum?) compared to his hps.

I run 3 led tents , mix my tap down around 200 ppm and the best thing I’ve done nute wise is QUIT using calmag, always had trouble with lock out. Just goes to show everyone’s grow is different

What's the best cal mag

What's the best cal mag

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